(~s)
1.
Something that is an ~ to something larger or more important is connected with it or helps to perform the same task.
Physical therapy is an important ~ to drug treatments...
= appendage
N-COUNT: oft N to/of n
2.
In grammar, an ~ is a word or group of words which indicates the circumstances of an action, event, or situation. An ~ is usually a prepositional phrase or an adverb group.
N-COUNT